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    <meta name="description" content="为什么要将IP转成Long将IP地址转换为长整数（long）并存入MySQL数据库的好处主要有以下几点：  存储效率：IP地址通常由四个字节组成，占据较大的存储空间。而将IP地址转换为长整数后，可以将其存储为整型，占用的存储空间将大大减少。这对于存储大量IP地址数据的数据库来说，能够显著提高存储效率。 查询效率：在MySQL中，整型数据的查询速度通常比字符串数据快。因为整型数据在索引和比较时更加高">
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            <h1 id="seo-header">IP转长整型</h1>
            
            
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                <h1 id="为什么要将IP转成Long"><a href="#为什么要将IP转成Long" class="headerlink" title="为什么要将IP转成Long"></a>为什么要将IP转成Long</h1><p>将IP地址转换为长整数（long）并存入MySQL数据库的好处主要有以下几点：</p>
<ul>
<li>存储效率：IP地址通常由四个字节组成，占据较大的存储空间。而将IP地址转换为长整数后，可以将其存储为整型，占用的存储空间将大大减少。这对于存储大量IP地址数据的数据库来说，能够显著提高存储效率。</li>
<li>查询效率：在MySQL中，整型数据的查询速度通常比字符串数据快。因为整型数据在索引和比较时更加高效。所以，将IP地址转换为长整数后，可以更快地查询和检索相关数据。</li>
<li>方便计算：长整数（long）可以方便地进行数学计算，例如判断IP地址是否在某个范围内，计算IP地址的距离等。这有助于更便捷地处理和操作IP地址数据。</li>
</ul>
<span id="more"></span>

<h1 id="转换"><a href="#转换" class="headerlink" title="转换"></a>转换</h1><p>比如要将IP地址192.168.222.255转换为长整型，可以通过以下步骤进行：</p>
<ul>
<li>将IP地址的每个部分转换为十进制数：192、168、222和255。</li>
<li>将每个部分按所在部分左移，第一部分左移24位，第二部分左移16位，第三部分左移8位，第四部分不懂，然后求和就变成如下二进制数组合：11000000(192)、10101000(168)、11011110(222)和11111111(255)。</li>
</ul>
<p>反解Long到IP步骤如下：</p>
<ul>
<li>将Long数据进行右移，第一部分右移24位，第二部分右移16位并用0xFF截取出8位，第三部分右移8位并用0xFF截取出8位，第四部分不有右移动并用0xFF截取出8位。</li>
</ul>
<p>注：转成2进制是方便查看移动并没有改变IP各部分的二进制数值（10进制不方便观察）</p>
<p>一个简单的实现可以见如下代码：</p>
<figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br><span class="line">29</span><br><span class="line">30</span><br><span class="line">31</span><br><span class="line">32</span><br><span class="line">33</span><br><span class="line">34</span><br><span class="line">35</span><br><span class="line">36</span><br><span class="line">37</span><br><span class="line">38</span><br><span class="line">39</span><br><span class="line">40</span><br><span class="line">41</span><br><span class="line">42</span><br><span class="line">43</span><br><span class="line">44</span><br><span class="line">45</span><br><span class="line">46</span><br><span class="line">47</span><br><span class="line">48</span><br><span class="line">49</span><br><span class="line">50</span><br><span class="line">51</span><br><span class="line">52</span><br><span class="line">53</span><br><span class="line">54</span><br><span class="line">55</span><br><span class="line">56</span><br><span class="line">57</span><br><span class="line">58</span><br><span class="line">59</span><br><span class="line">60</span><br><span class="line">61</span><br><span class="line">62</span><br><span class="line">63</span><br><span class="line">64</span><br><span class="line">65</span><br><span class="line">66</span><br><span class="line">67</span><br><span class="line">68</span><br><span class="line">69</span><br><span class="line">70</span><br><span class="line">71</span><br><span class="line">72</span><br><span class="line">73</span><br></pre></td><td class="code"><pre><code class="hljs java"><span class="hljs-keyword">public</span> <span class="hljs-keyword">class</span> <span class="hljs-title class_">IpLongUtils</span> &#123;<br>    <span class="hljs-comment">/**</span><br><span class="hljs-comment">     * 把字符串IP转换成long</span><br><span class="hljs-comment">     *</span><br><span class="hljs-comment">     * <span class="hljs-doctag">@param</span> ipStr 字符串IP</span><br><span class="hljs-comment">     * <span class="hljs-doctag">@return</span> IP对应的long值</span><br><span class="hljs-comment">     */</span><br>    <span class="hljs-keyword">public</span> <span class="hljs-keyword">static</span> <span class="hljs-type">long</span> <span class="hljs-title function_">ip2Long</span><span class="hljs-params">(String ipStr)</span> &#123;<br>        System.out.println(<span class="hljs-string">&quot;ipStr:&quot;</span> + ipStr);<br>        String[] ip = ipStr.split(<span class="hljs-string">&quot;\\.&quot;</span>);<br>        <br>        printBinaryRepresentationOfEachPart(ip);<br><br>        <span class="hljs-type">Long</span> <span class="hljs-variable">result</span> <span class="hljs-operator">=</span> (Long.valueOf(ip[<span class="hljs-number">0</span>]) &lt;&lt; <span class="hljs-number">24</span>) + (Long.valueOf(ip[<span class="hljs-number">1</span>]) &lt;&lt; <span class="hljs-number">16</span>)<br>                + (Long.valueOf(ip[<span class="hljs-number">2</span>]) &lt;&lt; <span class="hljs-number">8</span>) + Long.valueOf(ip[<span class="hljs-number">3</span>]);<br><br>        System.out.println(<span class="hljs-string">&quot;result:&quot;</span> + result);<br>        System.out.println(<span class="hljs-string">&quot;result二进制：&quot;</span> + Long.toBinaryString(result));<br>        <span class="hljs-keyword">return</span> result;<br>    &#125;<br><br>    <span class="hljs-keyword">private</span> <span class="hljs-keyword">static</span> <span class="hljs-keyword">void</span> <span class="hljs-title function_">printBinaryRepresentationOfEachPart</span><span class="hljs-params">(String[] ip)</span> &#123;<br>        System.out.println(<span class="hljs-string">&quot;第一位IP二进制：&quot;</span> + Long.toBinaryString(Long.valueOf(ip[<span class="hljs-number">0</span>])) );<br>        System.out.println(<span class="hljs-string">&quot;第一位IP左移24二进制：&quot;</span> + Long.toBinaryString((Long.valueOf(ip[<span class="hljs-number">0</span>])) &lt;&lt; <span class="hljs-number">24</span>) );<br><br>        System.out.println(<span class="hljs-string">&quot;第二位IP二进制：&quot;</span> + Long.toBinaryString(Long.valueOf(ip[<span class="hljs-number">1</span>])) );<br>        System.out.println(<span class="hljs-string">&quot;第二位IP左移16二进制：&quot;</span> +Long.toBinaryString((Long.valueOf(ip[<span class="hljs-number">1</span>])) &lt;&lt; <span class="hljs-number">16</span>) );<br><br>        System.out.println(<span class="hljs-string">&quot;第三位IP二进制：&quot;</span> + Long.toBinaryString(Long.valueOf(ip[<span class="hljs-number">2</span>])) );<br>        System.out.println(<span class="hljs-string">&quot;第三位IP左移8二进制：&quot;</span> +Long.toBinaryString((Long.valueOf(ip[<span class="hljs-number">2</span>])) &lt;&lt; <span class="hljs-number">8</span>) );<br><br>        System.out.println(<span class="hljs-string">&quot;第四位IP二进制：&quot;</span> + Long.toBinaryString(Long.valueOf(ip[<span class="hljs-number">3</span>])));<br>        System.out.println(<span class="hljs-string">&quot;第四位IP左移0二进制：&quot;</span> +Long.toBinaryString((Long.valueOf(ip[<span class="hljs-number">3</span>]))) );<br>    &#125;<br><br>    <span class="hljs-comment">/**</span><br><span class="hljs-comment">     * 把IP的long值转换成字符串</span><br><span class="hljs-comment">     *</span><br><span class="hljs-comment">     * <span class="hljs-doctag">@param</span> ipLong IP的long值</span><br><span class="hljs-comment">     * <span class="hljs-doctag">@return</span> long值对应的字符串</span><br><span class="hljs-comment">     */</span><br>    <span class="hljs-keyword">public</span> <span class="hljs-keyword">static</span> String <span class="hljs-title function_">long2Ip</span><span class="hljs-params">(<span class="hljs-type">long</span> ipLong)</span> &#123;<br>        <span class="hljs-type">StringBuilder</span> <span class="hljs-variable">ip</span> <span class="hljs-operator">=</span> <span class="hljs-keyword">new</span> <span class="hljs-title class_">StringBuilder</span>();<br>        <span class="hljs-type">long</span> <span class="hljs-variable">tmpIpLong</span> <span class="hljs-operator">=</span> ipLong &gt;&gt;&gt; <span class="hljs-number">24</span>;<br>        printTowData(tmpIpLong,<span class="hljs-string">&quot;第一位IP地址转换,右移24位&quot;</span>);<br>        ip.append(ipLong &gt;&gt;&gt; <span class="hljs-number">24</span>).append(<span class="hljs-string">&quot;.&quot;</span>);<br><br>        tmpIpLong = ipLong &gt;&gt;&gt; <span class="hljs-number">16</span>;<br>        printTowData(tmpIpLong,<span class="hljs-string">&quot;第二位IP地址转换,右移16位&quot;</span>);<br>        ip.append(tmpIpLong &amp; <span class="hljs-number">0xFF</span>).append(<span class="hljs-string">&quot;.&quot;</span>);<br><br>        tmpIpLong = ipLong &gt;&gt;&gt; <span class="hljs-number">8</span>;<br>        printTowData(tmpIpLong,<span class="hljs-string">&quot;第三位IP地址转换，右移8位&quot;</span>);<br>        ip.append(tmpIpLong &amp; <span class="hljs-number">0xFF</span>).append(<span class="hljs-string">&quot;.&quot;</span>);<br><br>        ip.append(ipLong &amp; <span class="hljs-number">0xFF</span>);<br>        printTowData(ipLong,<span class="hljs-string">&quot;第四位IP地址转换，右移0位&quot;</span>);<br><br>        <span class="hljs-keyword">return</span> ip.toString();<br>    &#125;<br><br>    <span class="hljs-keyword">private</span> <span class="hljs-keyword">static</span> <span class="hljs-keyword">void</span> <span class="hljs-title function_">printTowData</span><span class="hljs-params">(<span class="hljs-type">long</span> tmpIpLong, String comments)</span> &#123;<br>        System.out.println(comments);<br>        System.out.println(<span class="hljs-string">&quot;右移后的数据：&quot;</span> + Long.toBinaryString(tmpIpLong));<br>        System.out.println(<span class="hljs-string">&quot;&amp;0xFF截取8位：&quot;</span> + Long.toBinaryString(tmpIpLong &amp; <span class="hljs-number">0xFF</span>));<br>    &#125;<br><br>    <span class="hljs-keyword">public</span> <span class="hljs-keyword">static</span> <span class="hljs-keyword">void</span> <span class="hljs-title function_">main</span><span class="hljs-params">(String[] args)</span> &#123;<br>        System.out.println(<span class="hljs-string">&quot;ip 2 long : &quot;</span> + ip2Long(<span class="hljs-string">&quot;192.168.222.255&quot;</span>));<br>        System.out.println(<span class="hljs-string">&quot;long 2 ip : &quot;</span> + long2Ip(<span class="hljs-number">3232292607L</span>));<br>    &#125;<br><br>&#125;<br></code></pre></td></tr></table></figure>

<h1 id=""><a href="#" class="headerlink" title="&lt;&lt;和&gt;&gt;&gt;"></a>&lt;&lt;和&gt;&gt;&gt;</h1><ol>
<li><code>&lt;&lt;</code>: 左移运算符，num &lt;&lt; 1，相当于num乘以2,右边用0填充。</li>
<li><code>&gt;&gt;&gt;</code>: 无符号右移，忽略符号位，空位都以0补齐。</li>
</ol>
<p>下面代码是将IP第一部分左移24位，细节见下代码：</p>
<figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br></pre></td><td class="code"><pre><code class="hljs java">System.out.println(<span class="hljs-string">&quot;第一位IP二进制：&quot;</span> + Long.toBinaryString(Long.valueOf(ip[<span class="hljs-number">0</span>])) );<br>System.out.println(<span class="hljs-string">&quot;第一位IP左移24二进制：&quot;</span> + Long.toBinaryString((Long.valueOf(ip[<span class="hljs-number">0</span>])) &lt;&lt; <span class="hljs-number">24</span>) );<br><br><span class="hljs-comment">//第一位IP二进制：11000000</span><br><span class="hljs-comment">//第一位IP左移24二进制：11000000000000000000000000000000</span><br></code></pre></td></tr></table></figure>

<p>result二进制：11000000101010001101111011111111,下面的代码将最开始的8位二进制数据右移24位，然后与0xFF进行&amp;运算，截取8位数据，细节见下代码：</p>
<figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br></pre></td><td class="code"><pre><code class="hljs java"><span class="hljs-type">long</span> <span class="hljs-variable">tmpIpLong</span> <span class="hljs-operator">=</span> ipLong &gt;&gt;&gt; <span class="hljs-number">24</span>;<br>printTowData(tmpIpLong,<span class="hljs-string">&quot;第一位IP地址转换,右移24位&quot;</span>);<br>ip.append(ipLong &gt;&gt;&gt; <span class="hljs-number">24</span>).append(<span class="hljs-string">&quot;.&quot;</span>);<br><span class="hljs-comment">//第一位IP地址转换,右移24位</span><br><span class="hljs-comment">//右移后的数据：11000000</span><br><span class="hljs-comment">//&amp;0xFF截取8位：11000000</span><br></code></pre></td></tr></table></figure>


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